“Donald Trump stepped up his attack on Ted Cruz on Monday, tweeting that the Texas senator needs to “either settle his problem” of having been born in Canada or leave the race.

“It’s time for Ted Cruz to either settle his problem with the FACT that he was born in Canada and was a citizen of Canada, or get out of race,” Trump tweeted Monday morning, on the heels of Fox News polls released over the weekend that showed him with double-digit leads over Cruz in both Iowa and New Hampshire.

Trump has insisted over the course of the last month that Cruz needs to tackle the issue of his eligibility because he was born in Calgary, Canada, despite Cruz’s assertions that he is eligible based on the fact that his mother was born in the United States.”